1 / 10

Cooling channel issues

Cooling channel issues. U. Bravar Univ. of Oxford 31-Mar-2004. MICE channel plots. G4MICE requirements. What needs to be done to make these plots: Virtual planes user defined z-location Interface with ecalc9f to calculate e n Standard input beam to achieve De/e @ 15%.

prem
Download Presentation

Cooling channel issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cooling channel issues U. Bravar Univ. of Oxford 31-Mar-2004

  2. MICE channel plots

  3. G4MICE requirements What needs to be done to make these plots: • Virtual planes user defined z-location • Interface with ecalc9f to calculate en • Standard input beam to achieve De/e @ 15%

  4. Input beam • Define one standard (e.g. e^ = 6,000 mm mrad & b^ = 33 cm, start in middle of upstream spectrometer) • Save generated beam in file • Beam defined as x-px, rather than x-x’ • Place coils upstream of first tracker • Replace `beta = 420’ in G4MICE default • (Ability to software-select desired beam in upstream spectrometer)

  5. Why do we need a standard? Example: • Study of coil misalignment tolerances. Results depend on the following quantities: • Input beam • Emittance calculation • Channel geometry • Channel optics • RFs

  6. MICE magnetic field • MICE proposal lists six different current sets in Table 3.3 • Plus, want to simulate no-flip and semi-flip modes G4MICE present capabilities: • One default set of currents • Cannot do semi-flip (card FieldFlipOption) • Cannot change currents coil-by-coil • Cannot run MICE Stage III (card NumberOfCoolingCells) Improvements: • Have a set of coils and several currents available in data cards • Enable current definitions coil-by-coil • (Use G4MICE to optimize MICE channel optics)

  7. Channel optics • Use G4MICE to optimize channel optics • Three steps: i) fix currents in FC & CC to achieve desired b^ in LH ii) fix currents in EC & solenoid to achieve desired B in tracker iii) fix currents in MC to achieve constant b^ in tracker

  8. Geometry & Alignment • Obvious stuff: i) Actual shape for Al windows… ii) Local variations in LH density (convection) iii) Stay-clear area • Ability to displace every element in the MICE channel i) by fixed amount ii) random displacements

  9. RFs • Data card for static electric field • Data card for on-crest & off-crest • W-shaped cavities • RF phase: i) leading particle method ii) define phase RF-by-RF • Bf field produced by RFs

  10. G4MICE output • Currently we have: i) x,y,z,px, py, pz,t at fixed z (MC & Rec.) ii) two z-locations (one in each tracker) • Add: i) particle coordinates and momenta at fixed time (time is obtained from RF phase) ii) B-field and E-field iii) vector potential A • Insert: i) virtual planes, at any z along the channel, user’s choice ii) z-reference plane in upstream and downstream tracker

More Related